halkyon/packages/halkyon_app/test/app/about_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';
import 'package:halkyon_app/testing.dart';
import 'package:material_ui/material_ui.dart';

void main() {
  late TestAppDependencies dependencies;

  setUp(() => dependencies = TestAppDependencies());

  /// Opens About from a button, with [version], [legalese] and [children]
  /// as the app gives them.
  Future<void> open(
    WidgetTester tester, {
    String? version,
    String? legalese,
    List<Widget> children = const [],
    Locale locale = const Locale('en'),
  }) async {
    await tester.pumpWidget(
      testApp(
        Builder(
          builder: (context) => TextButton(
            onPressed: () => showAppAbout(
              context,
              version: version,
              legalese: legalese,
              children: children,
            ),
            child: const Text('About'),
          ),
        ),
        dependencies: dependencies,
        locale: locale,
      ),
    );
    await tester.tap(find.text('About'));
    await tester.pumpAndSettle();
  }

  testWidgets('names the app and where the source of what the instance runs '
      'is, which both licences require offering', (tester) async {
    await open(tester);

    expect(find.text('Halkyon Test'), findsWidgets);
    expect(find.text('The source of what this instance runs:'), findsOneWidget);
    expect(find.text('https://code.example.org/halkyon'), findsOneWidget);
    // Flutter's own button to every package's notice.
    expect(find.text('View licenses'), findsOneWidget);
  });

  testWidgets("says so when the instance can't be asked", (tester) async {
    dependencies.sourceCodeError = Exception('No connection');
    await open(tester);

    expect(
      find.text("Couldn't reach this instance to ask where its source is."),
      findsOneWidget,
    );
  });

  testWidgets("shows the app's version, legalese and own parts where it "
      'gives them', (tester) async {
    await open(
      tester,
      version: '0.18.0',
      legalese: 'Free software.',
      children: const [Text('Data in the app')],
    );

    expect(find.text('0.18.0'), findsOneWidget);
    expect(find.text('Free software.'), findsOneWidget);
    expect(find.text('Data in the app'), findsOneWidget);
  });

  testWidgets('speaks German', (tester) async {
    await open(tester, locale: const Locale('de'));

    expect(
      find.text('Der Quellcode dessen, was diese Instanz ausführt:'),
      findsOneWidget,
    );
  });
}